Ascension-pipe-lid-opening mechanism

ABSTRACT

The lid of an ascension pipe elbow is provided with a hinge lug and a counterweighted arm. The arm engages the lug and first breaks the tar seal around the cover and then pivots the cover to its full-open position. When the cover is closed, the counterweighted arm also tends to keep the cover in the closed position.

United States Patent [72] Inventor Gilbert C. Nestler t Pittsburgh. Pa. [21] AppI. No 862.221 [22] FiIed Sept. 30, 1969 [45] Patented July 6, 1971 [73] Assignec Koppers Company, Inc.

Attorneys-Sherman H. Barber and 01in E. Williams ASCENSION-PIPE-LID-OPENING MECHANISM 3 Claims, 2 Drawing Figs.

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33 in the closed position.

ASCENSION-PIPE-LID-OPENING MECHANISM BACKGROUND OF THE INVENTION Each coking chamber of a horizontal coke oven battery is provided with a single, or sometimes two standpipes or offtakes to carry away the volatile products liberated from the coal during the coking process. Each standpipe or offtake connects with a gas-collecting main through a gooseneck elbow. The elbow has an access opening for the admittance of a cleaning tool, and such opening is closed by a hinged elbow cover. When the elbow cover is open, the coking chamber is vented to the atmosphere.

The elbow cover is usually a massive structure and one or two workmen are required usually to pivot it from the closed to the open position. Such work is laborious and it is carried out in an environment of heat and dust which makes such work onerous and time consuming. In many instances, the elbow lid becomes sealed shut due to the accumulation of tar, and the like substances, around the elbow cover. To open such a sealed" cover manually requires considerable additional effort.

How the present invention overcomes the foregoing difficulty will be apparent to those skilled in the art from the following description of one embodiment of the invention.

SUMMARY OF THE INVENTION The cover for an ascension pipe elbow is provided with a lug and an arm is pivotally mounted adjacent the cover so that, when the arm pivots, a U-shaped strap on the arm cooperates with the lug to pivot the cover to the open position. A counterweight is fitted to the arm to balance the weight of the cover.

For a further understanding of the invention, and for advantages and features thereof, reference may be made to the following description in conjunction with the drawing which illustrates a preferred embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWING In the drawing:

FIG. 1 is a schematic elevational view ofa standpipe elbow that includes the present invention; and

FIG. 2 is a view along line Il-II of FIG. 1.

DETAILED DESCRIPTION Referring to FIG. 1, a conventional standpipe, or an ascension pipe 11 is fitted with a cover 13 that is hinged at pin 15 in a usual manner so that the cover can pivot clockwise, as viewed in FIG. 1.

The cover 13 is provided with a handle 17 that is fitted with an upwardly and outwardly projecting lifting lug 19, having a triangular shape about as shown in FIG. 1.

The hinge pin 15 carries a bifurcated arm 21 having two parallel side members 23 that are connected together at the outer end by a cylindrical-shaped counterweight 25, and that are further connected together at about midlength by a U- shaped strap 27. The U-shaped strap 27 is so located that when the arm 21 pivots about the pivot pin 15, the lifting lug 19 cooperates with the U-shaped strap 27, as suggested in FIG. 1.

When the elbow lid 13 is in the closed position, the bifurcated arm 2] is in a first position, A, suggested by the dotted outline in FIG. I. Now, when it is desired to open the elbow lid I3, a workman pivots the bifurcated arm 21 clockwise, as viewed in FIG. 1, so that the U-shaped strap 27 coacts with the lifting lug 19. The clockwise movement of the counterweighted arm 21 then exerts a force on the lug 19 that urges the elbow cover 13 to pivot clockwise.

If the elbow cover 13 is sealed internally by tarry deposits and the like around the opening of the elbow, the impact force produced by the counterweighted arm coacting with the lifting lug breaks the tar seal. Thereafter, the cover and arm pivot clockwise to the open position.

It will be noted that a bar stop 29 is provided on the bifurcated arm that engages the elbow structure when the cover is open and prevents the arm from pivoting too far, and that engages the lug when the cover is closed so that the arm will not pivot too far.

When the cover is closed, the lifting lug engages the U- shaped strap portion of the bifurcated arm and pivots the arm counterclockwise; the bifurcated arm pivoting beyond a vertical position to the original starting position. The counterweight, being located then to the left of a vertical axis through the pivot pin 15, tends to keep the cover closed.

Those skilled in the art will recognize that in the invention described herein there are many significant feature and advantages among which are:

That the bifurcated arm, when pivoted, produces an impact force on the elbow cover that cracks and breaks any tarry seal that may hold the cover in position;

That the cover is counterweighted wherefore it is readily and easily opened by a single workman; and

That the counterweighted arm, in the original position with the cover closed, keeps and maintains the cover in a closed position because of the location of the counterweight with relation to the pivot about which the arm moves.

What I claim is:

1. In a coke oven battery wherein coking ovens are provided with an ascension pipe and elbow, and wherein the elbow is provided with an opening and a pivotally mounted cover, the combination with said cover of:

a. a lug fitted to said cover;

b. an arm pivotally mounted adjacent said cover and having means cooperative with said lug for pivoting said cover from a closed position to an open position; and

c. a counterweight mounted to said arm for balancing the weight of said cover.

2. The invention of claim 1 including:

a. a means mounted to said arm for limiting the travel of said arm when said cover opens; and

b means mounted to said arm for limiting the travel of said arm when said cover closes to a position so that said arm tends to maintain said cover in the closed position.

3. The invention of claim 1 including:

a. A U-shaped strap that coacts with said lug to pivot said cover. 

1. In a coke oven battery wherein coking ovens are provided with an ascension pipe and elbow, and wherein the elbow is provided with an opening and a pivotally mounted cover, the combination with said cover of: a. a lug fitted to said cover; b. an arm pivotally mounted adjacent said cover and having means cooperative with said lug for pivoting said cover from a closed position to an open position; and c. a counterweight mounted to said arm for balancing the weight of said cover.
 2. The invention of claim 1 including: a. a means mounted to said arm for limiting the travel of said arm when said cover opens; and b. means mounted to said arm for limiting the travel of said arm when said cover closes to a position so that said arm tends to maintain said cover in the closed position.
 3. The invention of claim 1 including: a. A U-shaped strap that coacts with said lug to pivot said cover. 